The Prophet (SAWA) said, 'Allah Almighty has said, 'If one of My creation who knows Me disobeys Me, I will cause one of My creation who does not know Me to reign over him.' al-Faqih, v. 4, p. 404, no. 5871

The Prophet (SAWA) said, 'Whoever employs a worker from a group wherein someone else is more content with Allah than him [the person he chose], then he has betrayed Allah, His Messenger and the believers.' al-Targhib wa al-Tarhib, v. 3, p. 179, no. 1